Buck Rogers K4ABT Handbook page 53

Buck Rogers K4ABT
"2 N 1" Handbook
The Packet Radio by
; Packet Radio "The Basics" ; The X1J4 System Node Operator's (SNO) Handbook
Section 1 Section 2
This modification is for the older, pre 1990, (no suffix), MJF-1270. Most MFJ-1270"B" versions and all "C" versions are
already configured with this feature. To perform this modification, connect one end of a wire to pin 23 of the RS232
connector. Connect the other end of the wire to pins 1-2-3 of JMP9 (these three pins are already connected together on the
circuit board). This modification allows the TheNET X1 firmware to be configured for multi-frequency operation by
jumpering RS232 pins 10 and 23 together in the TNC-to-TNC cable.
X1J4 System Node Operators Handbook __ Page 53
ILLUSTRATION SECTION Charts & Node Drawings TheNET